Extralobar sequestrations represent what percentage of cases and present in which population as mass lesions?

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Extralobar sequestration is a congenital lung anomaly that lies outside the normal lung and has its own pleural covering, plus a systemic arterial blood supply (typically from the aorta). It accounts for about a quarter of pulmonary sequestration cases. Because it is a congenital lesion, it most commonly manifests in infancy as a discrete mass lesion, often detected on prenatal imaging or in neonates/infants with respiratory symptoms. In contrast, intralobar sequestration, which shares the visceral pleura with the normal lung, tends to present later in life with recurrent infections.